I can only speak for bankstown, but I have never had a problem with traffic when arriving for a full stop on, say, 29R while the circuit was buzzing around on 29L. There is never such a swarm of aircraft arriving for full stops that there is any difficulty sorting out that traffic. The only serious issue is the possibility of the training circuit getting over full- and that is relatively easily managed by the tower. I am not altogether opposed to the idea of limiting the traffic in the training circuit to a manageable number at any one time. The idea that the total GAAP area can only take six aeroplanes in both independent circuits is ludicrous. Perhaps we should be pushing the regulator to make a sensible regulation specific to YSBK. I am sure that other fields would be able to develop their own versions instead of this crazy one size fits all approach that is obviously unworkable for the industry and for those of us who enjoy being up there.